Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
  • C08G64/04—Aromatic polycarbonates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
  • C08G64/20—General preparatory processes
  • C08G64/30—General preparatory processes using carbonates
  • C08G64/305—General preparatory processes using carbonates and alcohols
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
  • C08G64/02—Aliphatic polycarbonates
  • C08G64/0208—Aliphatic polycarbonates saturated
  • C08G64/0225—Aliphatic polycarbonates saturated containing atoms other than carbon, hydrogen or oxygen
  • C08G64/0233—Aliphatic polycarbonates saturated containing atoms other than carbon, hydrogen or oxygen containing halogens
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G64/00—Macromolecular compounds obtained by reactions forming a carbonic ester link in the main chain of the macromolecule
  • C08G64/16—Aliphatic-aromatic or araliphatic polycarbonates
  • C08G64/1608—Aliphatic-aromatic or araliphatic polycarbonates saturated
  • C08G64/1625—Aliphatic-aromatic or araliphatic polycarbonates saturated containing atoms other than carbon, hydrogen or oxygen
  • C08G64/1633—Aliphatic-aromatic or araliphatic polycarbonates saturated containing atoms other than carbon, hydrogen or oxygen containing halogens

Definitions

• the present invention relates to a method for producing polycarbonate.
• This application claims priority based on Japanese Patent Application No. 2021-85297 filed in Japan on May 20, 2021 and Japanese Patent Application No. 2021-176302 filed in Japan on October 28, 2021. , the contents of which are hereby incorporated by reference.
• Polycarbonates are widely used in many fields as engineering plastics that are excellent in heat resistance, impact resistance, transparency, and the like. Polycarbonates are generally manufactured using raw materials derived from petroleum resources. However, in recent years, there is concern about the depletion of petroleum resources, and the use of raw materials derived from biomass resources such as plants is required.
• Polycarbonates using plant-derived isosorbide are known as polycarbonates using raw materials derived from biomass resources.
• a method for producing a polycarbonate using isosorbide a method of melt polycondensation of diphenyl carbonate, isosorbide, and optionally another dihydroxy compound (transesterification method) is known (Patent Document 1).
• the method of melt polycondensation of diphenyl carbonate and isosorbide or the like has the following problems.
• ⁇ High temperature is required to promote the transesterification reaction.
• polycondensation is carried out at a reaction temperature of 240° C. or higher.
• ⁇ Even if the reaction is carried out at a high temperature, the molecular weight does not increase and a high molecular weight product cannot be obtained.
• ⁇ Polycarbonate is decomposed and colored due to high temperature during polycondensation.
• Patent Document 2 does not consider using a dihydroxy compound other than an aromatic dihydroxy compound as the dihydroxy compound.
• the present invention provides a method for producing a high-molecular-weight polycarbonate starting from a non-aromatic dihydroxy compound at a relatively low temperature.
• the present invention has the following aspects.
• the following dihydroxy component and the following fluorine-containing carbonate component are reacted in the presence of a condensation catalyst,
• a method for producing a polycarbonate comprising heating the obtained prepolymer at a temperature lower than its melting temperature, and subjecting the prepolymer to solid-phase polymerization while discharging the fluorine-containing alcohol that is a by-product to the outside of the system.
• Dihydroxy component at least one non-aromatic dihydroxy compound selected from the group consisting of an alicyclic dihydroxy compound and a linear or branched aliphatic dihydroxy compound, or a mixture of the non-aromatic dihydroxy compound and an aromatic dihydroxy compound
• the alicyclic dihydroxy compound some of the carbon atoms may be substituted with oxygen atoms, and in the straight-chain or branched aliphatic dihydroxy compound, some of the carbon atoms are oxygen atoms. may be substituted.
• Fluorine-containing carbonate component consisting of a compound represented by the following formula (1), a compound represented by the following formula (2), a compound represented by the following formula (3), and a compound represented by the following formula (4) at least one compound selected from the group;
• R 1 is a group represented by CA 1 B 1 R 4 and two R 1s may be the same or different;
• R 2 is a group represented by CA 2 B 2 R 5 , two R 2 may be the same or different,
• R 3 is a hydrogen atom or a group represented by CA 3 B 3 R 6 , two R 3 may be the same or different,
• a 1 to A 3 are each independently a hydrogen atom, a fluorine atom or R f
• B 1 to B 3 are each independently a hydrogen atom, a fluorine atom or R f
• R 4 to R 6 are each independently a fluorine atom, R f or OR f
• R f is a fluoroalkyl group having 1 to 12 carbon atoms or a fluoroaryl group having 6 to 10 carbon atoms, and the carbon atoms of the fluoroalkyl group having 1 to 12 carbon atoms are partially substituted with oxygen atoms;
• R 1 is a group represented by CA 1 B 1 R 4
• R 2 is a group represented by CA 2 B 2 R 5
• R 3 is a hydrogen atom or a group represented by CA 3 B 3 R 6
• R 7 is a perfluoroalkylene group having 1 to 5 carbon atoms, and the perfluoroalkylene group having 1 to 5 carbon atoms may be partially substituted with an oxygen atom
• a 1 to A 3 are each independently a hydrogen atom, a fluorine atom or R f
• B 1 to B 3 are each independently a hydrogen atom, a fluorine atom or R f
• R 4 to R 6 are each independently a fluorine atom, R f or OR f
• R f is a fluoroalkyl group having 1 to 12 carbon atoms or a fluoroaryl group having 6 to 10 carbon atoms
• the carbon atoms of the fluoroalkyl group having 1 to 12 carbon atoms are partially substituted with oxygen
• R 7 is a perfluoroalkylene group having 1 to 5 carbon atoms
• two R 7 may be the same or different
• the perfluoroalkylene group having 1 to 5 carbon atoms is a part of the carbon atoms may be substituted with an oxygen atom.
• R 9 to R 13 are each independently a hydrogen atom, a fluorine atom or a fluoroalkyl group having 1 to 6 carbon atoms, and two R 9 , two R 10 , two R 11 , two R 12 and Each of the two R 13 may be the same or different, and has at least one fluorine atom in the molecule, and the C 1-6 fluoroalkyl group has some of the carbon atoms being oxygen atoms. may be substituted.
• the ratio of isosorbide to the total non-aromatic dihydroxy compound is 50 mol% or more.
• the number of carbon atoms in the alicyclic dihydroxy compound is preferably 2 to 20; more preferably 3 to 16; more preferably 4 to 13; particularly preferably 5 to 10, any of [1] to [7] or the manufacturing method according to item 1.
• the number of carbon atoms in the linear or branched aliphatic dihydroxy compound is preferably 2 to 20; more preferably 3 to 16; more preferably 4 to 13; The production method according to any one of [8].
• the number of carbon atoms in the aromatic dihydroxy compound is preferably 4 to 20; more preferably 6 to 19; further preferably 8 to 18; particularly preferably 10 to 17, any one of [1] to [9] 1.
• the fluorine-containing carbonate component is bis(1,1,1,3,3,3-hexafluoroisopropyl) carbonate, bis(perfluoro(t-butyl)) carbonate, and bis(2,2,3,3 ,4,4,5,5,6,6-decafluorocyclohexyl) carbonate is preferred; bis(1,1,1,3,3,3-hexafluoroisopropyl) carbonate is more preferable, the production method according to any one of [1] to [12].
• the condensation catalyst is preferably a tertiary amine; selected from the group consisting of triethylamine, tripropylamine, tributylamine, triisoamylamine, trihexylamine, triheptylamine, trioctylamine, and tridodecylamine. At least one is more preferred; at least one selected from the group consisting of triethylamine and tributylamine is even more preferred, the production method according to any one of [1] to [13].
• the reaction to obtain the prepolymer is carried out in a solvent, and the solvent is selected from the group consisting of acetonitrile, N,N-dimethylformamide (DMF), 1,4-dioxane, dichloromethane, chloroform, and chlorobenzene. Acetonitrile, DMF, and chlorobenzene are more preferred; Acetonitrile is more preferred, the production method according to any one of [1] to [14].
• the weight average molecular weight of the prepolymer is preferably 500 to 15,000; more preferably 500 to 10,000; particularly preferably 1,000 to 10,000, any one of [1] to [15] 1.
• the weight average molecular weight of the polycarbonate is preferably 10,000 to 100,000; more preferably 15,000 to 70,000; particularly preferably 20,000 to 60,000, [1] to [16].
• the production method according to any one of. [18] The dihydroxy component and the fluorine-containing carbonate component are reacted in the presence of the condensation catalyst, and then the solvent and by-produced fluorine-containing alcohol are distilled off to isolate a solid prepolymer.
• the heating temperature for solid phase polymerization of the prepolymer is preferably 200° C. or lower; more preferably 40° C. or higher and 200° C. or lower; further preferably 90° C. or higher and 195° C. or lower.
• the pressure for solid phase polymerization of the prepolymer is preferably 13 kPa (absolute pressure) (100 torr (absolute pressure)) or less; more preferably 1.3 kPa (absolute pressure) (10 torr (absolute pressure)) or less.
• Optical members (lenses, optical fibers, films, backlight diffusion plates for LCDs, photoreceptors, etc.), DVDs and CDs made of polycarbonate obtained by the production method according to any one of [1] to [22] Use in the manufacture of discs, electronic housings (mobile phones, etc.), windows for transport equipment, transparent roofing, windshields, screens, bulletproof windows, tableware, suitcases, or helmets.
• a fluorine-containing biscarbonate represented by the following formula (m1).
• R 1 is a group represented by CA 1 B 1 R 4 and two R 1s may be the same or different;
• R 2 is a group represented by CA 2 B 2 R 5 , two R 2 may be the same or different,
• R 3 is a hydrogen atom or a group represented by CA 3 B 3 R 6 , two R 3 may be the same or different,
• a 1 to A 3 are each independently a hydrogen atom, a fluorine atom or Rf
• B 1 to B 3 are each independently a hydrogen atom, a fluorine atom or R f
• R 4 to R 6 are each independently a fluorine atom, R f or OR f
• R f is a fluoroalkyl group having 1 to 12 carbon atoms or a fluoroaryl group having 6 to 10 carbon atoms, and the carbon atoms of the fluoroalkyl group having 1 to 12 carbon atoms are partially substituted with oxygen atoms;
• R a is a residue obtained by removing two
• Dihydroxy component at least one selected from the group consisting of an alicyclic dihydroxy compound and a linear or branched aliphatic dihydroxy compound, and the alicyclic dihydroxy compound has a portion of carbon atoms substituted with oxygen atoms. A portion of the carbon atoms in the linear or branched aliphatic dihydroxy compound may be substituted with oxygen atoms.
• Fluorine-containing carbonate component a compound represented by the following formula (1).
• R 1 is a group represented by CA 1 B 1 R 4 and two R 1s may be the same or different;
• R 2 is a group represented by CA 2 B 2 R 5 , two R 2 may be the same or different,
• R 3 is a hydrogen atom or a group represented by CA 3 B 3 R 6 , two R 3 may be the same or different,
• a 1 to A 3 are each independently a hydrogen atom, a fluorine atom or R f
• B 1 to B 3 are each independently a hydrogen atom, a fluorine atom or R f
• R 4 to R 6 are each independently a fluorine atom, R f or OR f
• R f is a fluoroalkyl group having 1 to 12 carbon atoms or a fluoroaryl group having 6 to 10 carbon atoms, and the carbon atoms of the fluoroalkyl group having 1 to 12 carbon atoms are partially substituted with oxygen atoms;
• a fluorine-containing biscarbonate represented by
• a high-molecular-weight polycarbonate can be produced from a non-aromatic dihydroxy compound as a raw material at a relatively low temperature.
• the compound represented by formula (1) is referred to as compound (1).
• Compounds represented by other formulas are similarly described.
• the meanings and definitions of the terms used in the present invention are as follows.
• “Etheric oxygen atom” means an oxygen atom that forms an ether bond.
• the "prepolymer” is a solid intermediate product obtained by stopping the condensation reaction between the raw material dihydroxy component and the fluorine-containing carbonate component at an appropriate point. means low polycarbonate.
• Solid state polymerization method means a polymerization method in which a prepolymer is polymerized to obtain a high-molecular-weight polycarbonate while the prepolymer remains in a solid state.
• Melting temperature of the prepolymer means the temperature at which the prepolymer melts, becomes liquid, or softens. The prepolymer is heated to a predetermined temperature and the temperature at which it becomes liquid or softens is visually determined.
• Weight average molecular weight and number average molecular weight are values in terms of standard polystyrene measured by gel permeation chromatography (GPC).
• GPC gel permeation chromatography
• Glass transition temperature is a temperature measured by a differential scanning calorimetry (DSC) method as a midpoint glass transition temperature according to JIS K 7121:1987.
• Crystalstallization means performing an operation to increase the crystallinity of a polymer.
• a “perfluoroalkylene group” means a group in which all hydrogen atoms of an alkylene group have been substituted with fluorine atoms.
• a “fluoroalkyl group” means a group in which some or all of the hydrogen atoms in an alkyl group have been replaced with fluorine atoms.
• " ⁇ " indicating a numerical range means that the numerical values before and after it are included as lower and upper limits.
• a method for producing a polycarbonate according to one aspect of the present invention includes the following steps a and b.
• Step a A step of reacting a specific dihydroxy component and a specific fluorine-containing carbonate component in the presence of a condensation catalyst to obtain a prepolymer.
• Step b A step of solid phase polymerization of the prepolymer to obtain a polycarbonate.
• the dihydroxy component is selected from the group consisting of alicyclic dihydroxy compounds (which may contain etheric oxygen atoms) and linear or branched aliphatic dihydroxy compounds (which may contain etheric oxygen atoms). At least one selected non-aromatic dihydroxy compound, or a mixture of this non-aromatic dihydroxy compound and an aromatic dihydroxy compound.
• the alicyclic dihydroxy compound (which may contain an etheric oxygen atom) includes, for example, an alicyclic structure (which may contain an etheric oxygen atom) and its ring skeleton directly or via a linking group. compounds having two hydroxyl groups linked together. Examples of the linking group include alkylene groups (methylene group, 1,1-dimethylethylene group, 2,2-dimethylpropylene group, etc.).
• Alicyclic structures may be monocyclic or polycyclic.
• a ring constituting an alicyclic structure (in the case of polycyclic, each of a plurality of rings constituting the alicyclic structure) may be, for example, a 4- to 7-membered ring.
• the number of etheric oxygen atoms that the alicyclic structure may contain is, for example, 1 to 2 per ring constituting the alicyclic structure.
• Other substituents may be bonded to the ring skeleton of the alicyclic structure.
• Other substituents include alkyl groups (methyl group, ethyl group, etc.), alkenyl groups (vinyl group, allyl group, etc.), and the like.
• alicyclic dihydroxy compound which may contain an etheric oxygen atom
• examples of the alicyclic dihydroxy compound include the following. 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, tricyclodecanedimethanol, pentacyclodecanepentadimethanol, 2,6-decanedimethanol, 1,5-deca Cycloalkanedimethanol such as phosphorus dimethanol, 2,3-decalindimethanol, 2,3-norbornanedimethanol, 2,5-norbornanedimethanol, 1,3-adamantanedimethanol; 1,2-cyclohexanediol, 1, 3-cyclohexanediol, 1,4-cyclohexanediol, tricyclodecanediol, pentacyclodecanediol, 2,6-decalindiol, 1,5-decalindiol, 2,3
• Linear or branched aliphatic dihydroxy compounds (which may contain an etheric oxygen atom) include, for example, an alkylene group (which may contain an etheric oxygen atom) and Examples include compounds having two hydroxyl groups.
• Alkylene groups may be linear or branched. The number of carbon atoms in the alkylene group is, for example, 1-10. The number of etheric oxygen atoms that the alkylene group may contain is, for example, 1-3.
• linear or branched aliphatic dihydroxy compounds which may contain an etheric oxygen atom
• alkanediols such as ethylenediol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, and 1,10-decanediol
• diethylene glycol polyethylene glycol such as triethylene glycol and tetraethylene glycol.
• isosorbide is preferable from the viewpoint of availability of plant-derived raw materials. Isosorbide and other non-aromatic dihydroxy compounds may be used in combination. As other non-aromatic dihydroxy compounds, alicyclic dihydroxy compounds other than isosorbide (however, even if they contain etheric oxygen atoms, is preferred, cycloalkanedimethanol or cycloalkanediol is more preferred, and cycloalkanedimethanol is even more preferred.
• the ratio of isosorbide to the total non-aromatic dihydroxy compound is preferably 50 mol% or more, more preferably 80 mol% or more, and may be 100 mol%. If the proportion of isosorbide is at least the above lower limit, the proportion of plant-derived components can be made higher.
• the ratio of isosorbide to the total non-aromatic dihydroxy compound is preferably 50 mol% or more, more preferably 70 mol% or more, and preferably 95 mol% or less. . If the proportion of isosorbide is at least the above lower limit, the proportion of plant-derived components can be increased, and if it is at most the above upper limit, moldability will be more excellent.
• the dihydroxy component is a mixture of a non-aromatic dihydroxy compound and an aromatic dihydroxy compound
• the performance (heat resistance, rigidity, toughness, etc.) of the polycarbonate is better than when the dihydroxy component consists of only the non-aromatic dihydroxy compound. tend to be better.
• the aromatic dihydroxy compound an aromatic compound having two phenolic hydroxyl groups is preferred.
• aromatic dihydroxy compounds include the following. 2,2-bis(4-hydroxyphenyl)propane (hereinafter also referred to as bisphenol A), 2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoropropane ( hereinafter also referred to as bisphenol AF), hydroquinone, 4,4′-dihydroxybiphenyl, 9,9-bis(4-hydroxyphenyl)fluorene, bis(4-hydroxyphenyl)ether, bis(4-hydroxyphenyl)thioether, bis(4-hydroxyphenyl)sulfone, bis(4-hydroxyphenyl)ketone and the like.
• bisphenol A 2,2-bis(4-hydroxyphenyl)propane
• bisphenol AF 2,2-bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoropropane
• hydroquinone 4,4′-dihydroxybiphenyl, 9,9-bis(4-hydroxyphenyl)fluorene
• bisphenol A or bisphenol AF is preferable, and bisphenol A is particularly preferable, in view of the availability of raw materials and the usefulness of polycarbonate.
• the ratio of isosorbide to the entire dihydroxy component is preferably 40 to 95 mol%, preferably 50 to 90. Mole % is more preferred. If the proportion of isosorbide is at least the above lower limit, the proportion of plant-derived components can be increased, and if it is at most the above upper limit, moldability will be more excellent.
• the dihydroxy component is isosorbide.
• the dihydroxy component is a mixture of isosorbide and an aromatic dihydroxy compound.
• the aromatic dihydroxy compound is bisphenol A or bisphenol AF are preferred, and those in which the aromatic dihydroxy compound is bisphenol A are particularly preferred.
• the ratio of isosorbide to the total dihydroxy component is preferably 40 to 95 mol%, more preferably 50 to 90 mol%.
• the dihydroxy component is a mixture of isosorbide and an alicyclic dihydroxy compound containing no etheric oxygen atoms.
• cycloalkanedimethanol is preferred as the alicyclic dihydroxy compound
• 1,4-cyclohexanedimethanol is particularly preferred as the alicyclic dihydroxy compound.
• the ratio of isosorbide to the total dihydroxy component is preferably 40 to 95 mol%, more preferably 50 to 90 mol%.
• the dihydroxy component is a mixture of isosorbide, an alicyclic dihydroxy compound free of etheric oxygen atoms, and an aromatic dihydroxy compound.
• the aromatic dihydroxy compound is bisphenol A or bisphenol AF and the alicyclic dihydroxy compound is cycloalkanedimethanol, and the aromatic dihydroxy compound is bisphenol A and the alicyclic dihydroxy compound is 1,4-cyclohexane.
• dimethanol is dimethanol.
• the ratio of isosorbide to the total dihydroxy component is preferably 40 to 95 mol%, more preferably 50 to 90 mol%.
• the ratio of the aromatic dihydroxy compound to the total dihydroxy component is preferably 5 to 60 mol%, more preferably 10 to 50 mol%.
• the fluorine-containing carbonate component is at least one compound selected from the group consisting of compound (1), compound (2), compound (3) and compound (4).
• R 1 is a group represented by CA 1 B 1 R 4
• two R 1s may be the same or different
• R 2 is a group represented by CA 2 B 2 R 5
• two R 2 may be the same or different
• R 3 is a hydrogen atom or a group represented by CA 3 B 3 R 6
• two R 3 may be the same or different
• a 1 to A 3 are each hydrogen atom, fluorine atom or R f
• B 1 to B 3 are each hydrogen atom, fluorine atom or R f
• R 4 to R 6 are fluorine is an atom, R f or OR f
• R f is a C 1-12 fluoroalkyl group (which may contain an etheric oxygen atom) or a C 6-10 fluoroaryl group.
• R 1 is a group represented by CA 1 B 1 R 4
• R 2 is a group represented by CA 2 B 2 R 5
• R 3 is a hydrogen atom or CA 3 B 3 R 6
• R 7 is a perfluoroalkylene group having 1 to 5 carbon atoms (which may contain an etheric oxygen atom)
• a 1 to A 3 are each a hydrogen atom
• fluorine is an atom or R f
• B 1 to B 3 are each a hydrogen atom
• R 4 to R 6 are a fluorine atom, R f or OR f and R f is the number of carbon atoms It is a fluoroalkyl group of 1 to 12 (which may contain an etheric oxygen atom) or a fluoroaryl group of 6 to 10 carbon atoms.
• R 7 is a perfluoroalkylene group having 1 to 5 carbon atoms (which may contain an etheric oxygen atom), and two R 7 may be the same or different.
• R 9 to R 13 each represent a hydrogen atom, a fluorine atom or a fluoroalkyl group having 1 to 6 carbon atoms (which may contain an etheric oxygen atom), two R 9 and two R 10 , two R 11 , two R 12 and two R 13 may be the same or different and have at least one fluorine atom in the molecule.
• fluorine-containing carbonate component examples include the following. bis(1,1,1,3,3,3-hexafluoroisopropyl) carbonate, ((CF 3 CF 2 )(CF 3 )CHO) 2 CO, ((CF 3 CF 2 ) 2 CHO) 2 CO, bis (perfluoro(t-butyl)) carbonate, bis(2,2,3,3,4,4,5,5-octafluorocyclopentyl) carbonate, bis(2,2,3,3,4,4,5, 5,6,6-decafluorocyclohexyl) carbonate, bis(perfluorophenyl) carbonate, bis(m-trifluoromethylphenyl) carbonate, bis(o-trifluoromethylphenyl) carbonate, bis(p-trifluoromethylphenyl) carbonate and the like.
• fluorine-containing carbonate component bis(1,1,1,3,3,3-hexafluoroisopropyl) carbonate, bis(perfluoro(t-butyl)) carbonate, or bis(2 ,2,3,3,4,4,5,5,6,6-decafluorocyclohexyl)carbonate is preferred.
• fluorine-containing carbonate component bis(1,1,1,3,3,3-hexafluoroisopropyl) carbonate is used in view of the availability of raw materials, the ease of production of the fluorine-containing carbonate, and the ability to produce a high-molecular-weight polycarbonate. is particularly preferred.
• the fluorine-containing carbonate component is preferably obtained by a reaction using a fluorine-containing alcohol as a starting material. At least one selected from the group consisting of compound (5) and compound (6) is preferable as the fluorine-containing alcohol.
• R 1 is a group represented by CA 1 B 1 R 4
• R 2 is a group represented by CA 2 B 2 R 5
• R 3 is a hydrogen atom or CA 3 B 3 R 6
• R 7 is a perfluoroalkylene group having 1 to 5 carbon atoms (which may contain etheric oxygen)
• a 1 to A 3 are each a hydrogen atom and a fluorine atom.
• R f , B 1 to B 3 are each a hydrogen atom, a fluorine atom or R f , R 4 to R 6 are a fluorine atom, R f or OR f and R f has 1 carbon atom to 12 fluoroalkyl groups (which may contain etheric oxygen) or C6-10 fluoroaryl groups.
• the fluorine-containing alcohol preferably has a higher degree of acid dissociation than that of the aromatic dihydroxy compound from the viewpoint of improving the transesterification reaction rate. Therefore, secondary or tertiary fluorine-containing alcohols in which a fluoroalkyl group is directly bonded to the carbon atom at the ⁇ -position of a hydroxyl group (hereinafter referred to as ⁇ -carbon) are preferred. However, an alcohol in which a fluorine atom is directly bonded to the ⁇ carbon is not preferable because it is likely to undergo a decomposition reaction due to a dehydrogenation reaction.
• R 3 is a group represented by CA 3 B 3 R 6 because the more fluoroalkyl groups bonded to the ⁇ carbon, the higher the degree of acid dissociation of the fluorine-containing alcohol.
• a tertiary fluorine-containing alcohol is preferred.
• a secondary fluorine - containing alcohol in which R3 is a hydrogen atom is preferred.
• the pKa of the fluorine-containing alcohol can be used as a measure of the degree of acid dissociation.
• the pKa of the fluorine-containing alcohol is preferably 12 or less, more preferably 11 or less, and particularly preferably 10 or less, from the viewpoint of improving the transesterification reaction rate.
• the pKa of the fluorine-containing alcohol is preferably 5 or more from the viewpoint of availability of raw materials and ease of production of the fluorine-containing carbonate component.
• the number of carbon atoms in the fluorine-containing alcohol is preferably 2-10. If the fluorine-containing alcohol has 2 or more carbon atoms, a stable fluorine-containing alcohol in which a fluorine atom is not directly bonded to the ⁇ -position of the hydroxyl group can be selected. If the carbon number of the fluorine-containing alcohol is 10 or less, when distilling off the fluorine-containing alcohol that dissociates during the transesterification reaction, it has a boiling point that can be easily removed under mild conditions, so it is necessary to apply a high temperature during the transesterification reaction. can produce high-quality polycarbonate.
• fluorine-containing alcohol examples include the following. 1,1,1,3,3,3-hexafluoroisopropanol (pKa: 9.4), (CF 3 CF 2 )(CF 3 )CHOH (pKa: 9.5), (CF 3 CF 2 ) 2 CHOH (pKa: 10.6), perfluoro(t-butyl) alcohol (pKa: 5.3), 2,2,3,3,4,4,5,5-octafluorocyclopentanol, 2,2,3 , 3,4,4,5,5,6,6-decafluorocyclohexanol and the like.
• fluorine-containing alcohol from the point of acid dissociation, 1,1,1,3,3,3-hexafluoroisopropanol, perfluoro(t-butyl) alcohol, or 2,2,3,3,4,4, 5,5,6,6-decafluorocyclohexanol is preferred.
• 1,1,1,3,3,3-hexafluoroisopropanol is particularly preferable in terms of availability and ease of production of the fluorine-containing carbonate component.
• Examples of the method for producing the fluorine-containing carbonate component include a method of reacting a fluorine-containing alcohol with phosgenes, dialkyl carbonate, compound (7), and the like.
• X 11 to X 13 are each a hydrogen atom or a halogen atom, at least one of X 11 to X 13 is a halogen atom, X 14 to X 16 are each a hydrogen atom or a halogen atom, At least one of X 14 to X 16 is a halogen atom. All of X 11 to X 16 are preferably halogen atoms, more preferably all fluorine atoms or chlorine atoms, and particularly preferably all chlorine atoms from the viewpoint of obtaining chloroform as a by-product.
• reaction with phosgenes is preferable from the viewpoint of yield, and a reaction with triphosgene is preferable from the viewpoint of ease of handling. Reaction is more preferred.
• a fluorine-containing alcohol and triphosgene can be reacted in a solvent in the presence of a basic catalyst. As the solvent, toluene is preferable because it is easy to purify.
• the base catalyst is preferably at least one selected from the group consisting of tertiary amines, alkali metal hydrides, alkaline earth metal hydrides, alkali metals and alkaline earth metals.
• the reaction temperature is preferably -50 to 60°C.
• Condensation catalysts include basic transesterification catalysts.
• Basic transesterification catalysts include nitrogen-containing compounds, alkali metal compounds, alkaline earth metal compounds, and the like.
• Nitrogen-containing compounds include amines, quaternary ammonium hydroxides, salts of amines, and the like.
• Alkali metal compounds or alkaline earth metal compounds include organic acid salts, inorganic salts, oxides, hydroxides, hydrides and alkoxides of alkali metals or alkaline earth metals.
• Condensation catalysts may be used alone or in combination of two or more.
• amines are preferable from the viewpoint of high polymerization activity and excellent applicability to solution polymerization for producing prepolymers.
• nitrogen-containing compounds include tertiary amines (triethylamine, tripropylamine, tributylamine, triisoamylamine, trihexylamine, triheptylamine, trioctylamine, tridodecylamine, etc.), secondary amines ( diethylamine, dibutylamine, etc.), primary amines (propylamine, butylamine, etc.), imidazoles (2-methylimidazole, 2-phenylimidazole, benzimidazole, etc.), quaternary ammonium having an alkyl group and/or an aryl group, etc.
• tertiary amines triethylamine, tripropylamine, tributylamine, triisoamylamine, trihexylamine, triheptylamine, trioctylamine, tridodecylamine, etc.
• secondary amines diethylamine, dibutyl
• Hydroxides tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, trimethylbenzylammonium hydroxide, etc.
• alkali metal compounds include sodium hydroxide, potassium hydroxide, cesium hydroxide, lithium hydroxide, sodium hydrogen carbonate, sodium carbonate, potassium carbonate, cesium carbonate, lithium carbonate, sodium acetate, potassium acetate, cesium acetate, Lithium Acetate, Sodium Stearate, Potassium Stearate, Cesium Stearate, Lithium Stearate, Sodium Borohydride, Sodium Phenylborohydride, Sodium Phenylborohydride, Sodium Benzoate, Potassium Benzoate, Cesium Benzoate, Lithium Benzoate, Disodium Hydrogen Phosphate, Dipotassium Hydrogen Phosphate, Disodium Phenyl Phosphate, Sodium Gluconate, Disodium Salt, Dipotassium Salt, Dicesium Salt, Dilithium Salt of Bisphenol A, Sodium Salt of Phenol, Potassium Salt, Cesium salts and lithium salts.
• alkaline earth metal compounds include magnesium hydroxide, calcium hydroxide, strontium hydroxide, barium hydroxide, magnesium hydrogen carbonate, calcium hydrogen carbonate, strontium hydrogen carbonate, barium hydrogen carbonate, magnesium carbonate, calcium carbonate, and carbonate.
• Step a A prepolymer is obtained by reacting a dihydroxy component and a fluorine-containing carbonate component in the presence of a condensation catalyst. Specifically, for example, a dihydroxy component and a fluorine-containing carbonate component are reacted in a solvent in the presence of a condensation catalyst, and then the solvent and by-produced fluorine-containing alcohol are distilled off to obtain a solid prepolymer. get It is preferred to dry the prepolymer at a temperature below the glass transition temperature of the prepolymer.
• solvents examples include acetonitrile, N,N-dimethylformamide (DMF), 1,4-dioxane, dichloromethane, chloroform, chlorobenzene and the like.
• acetonitrile, DMF, and chlorobenzene are preferable from the viewpoint of solubility of the raw material.
• the molar ratio of the fluorine-containing carbonate component to the dihydroxy component (fluorine-containing carbonate component/dihydroxy component) in step a is preferably 1/1 to 2/1, more preferably 1/1 to 1.3/1. 02/1 to 1.2/1 are particularly preferred. If the molar ratio of the fluorine-containing carbonate component and the dihydroxy component is within the above range, it is easy to obtain a prepolymer having terminal structural units derived from the fluorine-containing carbonate component. A prepolymer having terminal structural units derived from a fluorine-containing carbonate component readily undergoes solid phase polymerization without crystallizing the prepolymer, as described later. Further, even at a temperature below the glass transition temperature of the prepolymer, solid phase polymerization proceeds.
• the weight average molecular weight of the prepolymer is preferably 500-15,000, more preferably 500-10,000, and particularly preferably 1,000-10,000. If the weight-average molecular weight of the prepolymer is within this range, the prepolymer is in a powder state and the solid-phase polymerization in step b easily proceeds.
• the glass transition temperature of the prepolymer is preferably 60°C or higher, more preferably 70°C or higher, and particularly preferably 80°C or higher. Moreover, the glass transition temperature of the prepolymer is preferably 160° C. or lower. When the glass transition temperature of the prepolymer is at least the above lower limit and at most the above upper limit, the prepolymer does not melt and the solid phase polymerization in step b easily proceeds at a low temperature.
• the molar ratio of the fluorine-containing alkoxy terminal group to be blocked derived from the fluorine-containing carbonate component of the prepolymer obtained in step a to the hydroxyl group terminal group derived from the dihydroxy component (fluorinated alkoxy terminal group/hydroxyl group) is 0.8/1. ⁇ 1.4/1 is preferred, 0.9/1 to 1.3/1 is more preferred, and 0.95/1 to 1.25/1 is particularly preferred.
• the content of fluorine-containing alkoxy terminal groups is at least the above lower limit, it is possible to prevent the concentration of hydroxyl groups at the terminal ends of the polycarbonate obtained by the solid phase polymerization in step b from increasing.
• the content of fluorine-containing alkoxy terminal groups is equal to or less than the above upper limit, a sufficiently high-molecular-weight polycarbonate can easily be obtained.
• the molar ratio of terminal groups of polymers is preferably analyzed by 1 H-NMR analysis of the polymer.
• a specific 1 H-NMR analysis method is as described in Examples of WO 2014/171367.
• the prepolymer obtained in step a is usually obtained in the form of a solution since a solvent is used during production. Therefore, the solvent and by-produced fluorine-containing alcohol are distilled off to isolate a solid prepolymer. It is preferable to vacuum dry the prepolymer at a low temperature to remove residual solvent and the like.
• the prepolymer may be in a powdery or candy-like state, for example.
• a powder state is preferable in that the solid phase polymerization in the step b proceeds easily.
• a powdery prepolymer can be obtained, for example, by pulverizing the solid prepolymer obtained as described above.
• Various known powdering methods can be used, for example, a method of mechanical pulverization, a method of mechanical pulverization under freezing, and the like.
• the average particle size of the powdered prepolymer is preferably 0.1 ⁇ m to 1 mm, more preferably 1 ⁇ m to 500 ⁇ m, and particularly preferably 3 ⁇ m to 200 ⁇ m. If the average particle size is within this range, a powdery prepolymer can be obtained by a simple operation. In addition, the solid phase polymerization in step b is likely to proceed.
• Step b A polycarbonate is obtained by heating the prepolymer at a temperature below its melting temperature without going through a step of crystallizing the prepolymer, and performing solid phase polymerization of the prepolymer while discharging the by-produced fluorine-containing alcohol out of the system. .
• the heating temperature is lower than the melting temperature of the prepolymer, preferably 200° C. or lower, more preferably 195° C. or lower. If the heating temperature is below the melting temperature, the reaction proceeds in the solid phase. In particular, if the heating temperature is 200° C. or less, the coloring of the carbonate due to heat can be suppressed.
• the heating temperature is preferably 40° C. or higher, more preferably 90° C. or higher. When the heating temperature is at least the above lower limit, the reaction proceeds easily and the productivity of the polycarbonate is high.
• step b it is preferable to start heating at a temperature of around 40 to 110°C, gradually increase the temperature, and finally reach a temperature of 180 to 200°C.
• the prepolymer By heating the prepolymer in this way, the solid-phase polymerization proceeds easily, and a high-molecular-weight polycarbonate with suppressed coloring can be obtained. Moreover, the productivity of polycarbonate is high.
• the heating time is preferably 1 to 48 hours, more preferably 2 to 36 hours, and particularly preferably 3 to 24 hours. If the heating time is within the above range, the productivity of polycarbonate is high and suitable for industrial production.
• Examples of the method for discharging the fluorine-containing alcohol by-produced during solid phase polymerization to the outside of the system include a method of solid phase polymerization under reduced pressure, a method of solid phase polymerization while blowing an inert gas, and a method of using these together.
• the method of introducing an inert gas requires the reuse of the inert gas discharged out of the system, resulting in a complicated process. Therefore, the method of performing solid phase polymerization under reduced pressure is more preferable.
• the pressure at which the prepolymer is solid-phase polymerized under reduced pressure is preferably a high vacuum region of 13 kPa (absolute pressure) (100 torr (absolute pressure)) or less, and 1.3 kPa (absolute pressure) (10 torr (absolute pressure)) or less. is more preferred, and 0.67 kPa to 0.013 kPa (absolute pressure) (5 to 0.1 torr (absolute pressure)) is particularly preferred. If the pressure is within the above range, the solid phase polymerization proceeds quickly.
• An inert gas means a gas that is inert to solid phase polymerization, and includes nitrogen, argon, helium, carbon dioxide, lower hydrocarbons, acetone and the like.
• the apparatus may be of any type, such as a batch type, a continuous type, or a combination of these types. Specific examples include tumbler type, kiln type, paddle dryer type, screw conveyor type, vibrating type, fluidized bed type, fixed bed type, moving bed type and the like. As an apparatus for experiments, a vacuum dryer or the like used for drying polymers can also be used.
• the weight average molecular weight of the finally obtained polycarbonate is preferably 10,000 to 100,000, more preferably 15,000 to 70,000, and particularly preferably 20,000 to 60,000.
• the weight-average molecular weight of the polycarbonate is at least the above lower limit, the heat resistance, rigidity and toughness are more excellent, and when it is at most the above upper limit, the moldability is more excellent.
• a specific dihydroxy component is reacted with a specific fluorine-containing carbonate component, so that a prepolymer having terminal structural units derived from the fluorine-containing carbonate component is obtained.
• a prepolymer having a structural unit derived from a fluorine-containing carbonate component at its end has a high affinity with other prepolymers, and is easily transesterified. It is thought that transesterification reaction solid state polymerization proceeds even at a relatively low temperature below the melting temperature of (for example, even at a temperature of 200° C. or less).
• a prepolymer obtained by reacting a specific dihydroxy component with a diaryl carbonate or dialkyl carbonate other than a specific fluorine-containing carbonate component has a structural unit derived from a terminal diaryl carbonate or dialkyl carbonate that is different from other prepolymers. Since the affinity is low and the transesterification reaction is difficult, it is considered that the solid phase polymerization does not proceed unless the temperature is raised (for example, 240° C. or higher).
• the inventors of the present invention believed that in the method of International Publication No. 2014/171367, the benzene ring of the aromatic dihydroxy compound was stacked, and the transesterification reaction proceeded even in the solid state polymerization. It was surprising that the transesterification reaction proceeded in the solid state polymerization even without the presence of the benzene ring.
• the dihydroxy component is an alicyclic dihydroxy compound (which may contain an etheric oxygen atom) or a linear or branched aliphatic dihydroxy compound (which may contain an etheric oxygen atom). ), and by appropriately adjusting the reaction conditions (e.g., lowering the reaction temperature, shortening the reaction time), the fluorine-containing Biscarbonates can also be obtained.
• the amount of the fluorine-containing carbonate component used may be at least 2 times the moles of the dihydroxy component, but is preferably no more than 10 times the moles, more preferably no more than 7 times the moles, and 4 times the moles of the dihydroxy component. Molar or less is particularly preferred.
• R 1 is a group represented by CA 1 B 1 R 4 and two R 1s may be the same or different;
• R 2 is a group represented by CA 2 B 2 R 5 , two R 2 may be the same or different,
• R 3 is a hydrogen atom or a group represented by CA 3 B 3 R 6 , two R 3 may be the same or different,
• a 1 to A 3 are each a hydrogen atom, a fluorine atom or R f
• B 1 to B 3 are each hydrogen atom, fluorine atom or R f
• R 4 to R 6 are a fluorine atom, R f or OR f ;
• R f is a fluoroalkyl group having 1 to 12 carbon atoms (which may contain an etheric oxygen atom) or a fluoroaryl group having 6 to 10 carbon atoms
• R a is an alicyclic dihydroxy compound (which may contain an etheric oxygen atom) or a linear or branched aliphatic dihydroxy compound
• R 1 is a group represented by CA 1 B 1 R 4
• R 2 is a group represented by CA 2 B 2 R 5
• R 3 is a hydrogen atom or a group represented by CA 3 B 3 R 6
• R 7 is a perfluoroalkylene group having 1 to 5 carbon atoms (which may contain an etheric oxygen atom)
• a 1 to A 3 are each a hydrogen atom, a fluorine atom or R f
• B 1 to B 3 are each hydrogen atom, fluorine atom or R f
• R 4 to R 6 are a fluorine atom, R f or OR f
• R f is a fluoroalkyl group having 1 to 12 carbon atoms (which may contain an etheric oxygen atom) or a fluoroaryl group having 6 to 10 carbon atoms
• R a is an alicyclic dihydroxy compound (which may contain an etheric oxygen atom) or a linear or branched aliphatic dihydroxy compound (which may
• R 7 is a perfluoroalkylene group having 1 to 5 carbon atoms (which may contain an etheric oxygen atom), two R 7 may be the same or different, R a is an alicyclic dihydroxy compound (which may contain an etheric oxygen atom) or a linear or branched aliphatic dihydroxy compound (which may contain an etheric oxygen atom) and two hydroxyl groups; is the residue excluding
• R 9 to R 13 each represent a hydrogen atom, a fluorine atom or a fluoroalkyl group having 1 to 6 carbon atoms (which may contain an etheric oxygen atom), two R 9 and two R 10 , two R 11 , two R 12 and two R 13 may be the same or different, and have at least one fluorine atom in the molecule, R a is an alicyclic dihydroxy compound (which may contain an etheric oxygen atom) or a linear or branched aliphatic dihydroxy compound (which may contain an etheric oxygen atom) and two hydroxyl groups; is the residue excluding
• a high-molecular-weight polycarbonate can be produced from a non-aromatic dihydroxy compound as a raw material in the same manner as in the production method described above.
• the fluorine-containing biscarbonate is reacted alone or together with any dihydroxy compound in the presence of a condensation catalyst to obtain a prepolymer in the same manner as in step a.
• the obtained prepolymer is heated at a temperature lower than its melting temperature, and the prepolymer is solid-phase polymerized while the by-produced fluorine-containing alcohol is discharged out of the system to obtain a polycarbonate in the same manner as in step b.
• Optional dihydroxy compounds include, for example, the aforementioned alicyclic dihydroxy compounds, linear or branched aliphatic dihydroxy compounds, and aromatic dihydroxy compounds.
• Example 1 203.7 mg (1.394 mmol) of isosorbide was weighed into a heat-resistant glass test tube (15/35 common grinder) with an outer diameter of 21 mm and a total length of 130 mm. A stopcock was attached, and drying was carried out for half a day under vacuum through a diphosphorus pentoxide trap. Then, the inside of the test tube was replaced with nitrogen, and under a nitrogen stream, 0.8 mL of dry acetonitrile, 532 mg (1.469 mmol) of bis(1,1,1,3,3,3-hexafluoroisopropyl) carbonate, tri(n -Butyl)amine 13.2 mg (0.0712 mmol) was added to obtain a homogeneous solution.
• Example 2 200 mg (1.369 mmol) of isosorbide and 50 mg (0.348 mmol) of 1,4-cyclohexanedimethanol were weighed into a heat-resistant glass test tube (15/35 common sliver) with an outer diameter of 21 mm and a total length of 130 mm. After inserting a fluoroethylene stirrer tip, a glass three-way cock was attached, and the mixture was dried for half a day by passing it through a diphosphorus pentoxide trap under vacuum.
• a portion of the homogeneous solution was taken and analyzed by 1 H-nuclear magnetic resonance spectroscopy and GPC.
• the homogeneous solution remaining in the test tube was vacuum dried to give a white powdery substance.
• the reactants in the test tube were in a solid state throughout.
• the final product had a weight-average molecular weight of 20,746 and a number-average molecular weight of 10,699, and gave signals in the 1 H-nuclear magnetic resonance spectrum supporting a structure derived from copolymerized polycarbonate.
• Example 3 199.9 mg (1.368 mmol) of isosorbide and 78.2 mg (0.343 mmol) of bisphenol A were weighed into a heat-resistant glass test tube (15/35 common grind) with an outer diameter of 21 mm and a total length of 130 mm, and polytetrafluoro After adding an ethylene stirrer tip, a glass three-way cock was attached, and the mixture was dried for half a day in a vacuum with a phosphorous pentoxide trap.
• a portion of the homogeneous solution was taken and analyzed by 1 H-nuclear magnetic resonance spectroscopy and GPC.
• the homogenous solution remaining in the test tube was dried under vacuum to give a powdery substance.
• a portion was taken out and analyzed by 1 H-nuclear magnetic resonance spectroscopy and GPC.
• the product was pulverized, the inside of the test tube was again replaced with nitrogen, and the mixture was similarly heated under vacuum (170° C.
• the reactants in the test tube were in a solid state throughout.
• the final product had a weight-average molecular weight of 32,861 and a number-average molecular weight of 16,066, and gave signals in the 1 H-nuclear magnetic resonance spectrum supporting a structure derived from copolymerized polycarbonate.
• Example 4 137 mg (0.937 mmol) of isosorbide, 137 mg (0.600 mmol) of bisphenol A, 22 mg (0.600 mmol) of bisphenol A, and 22 mg (0.600 mmol) of 1,4-cyclohexanedimethanol were placed in a heat-resistant glass test tube with an outer diameter of 21 mm and a total length of 130 mm. 0.153 mmol) was weighed, a polytetrafluoroethylene stirrer tip was added, a glass three-way cock was attached, and the mixture was dried under vacuum for half a day through a phosphorus pentoxide trap.
• test tube was replaced with nitrogen, and under a nitrogen stream, 1.0 mL of dry acetonitrile, 641 mg (1.770 mmol) of bis(1,1,1,3,3,3-hexafluoroisopropyl) carbonate, tri(n -Butyl)amine 12.7 mg (0.0685 mmol) was added to obtain a homogeneous solution.
• the homogeneous solution was heated at 90° C. for 70 hours while stirring with a magnetic stirrer. Acetonitrile was distilled off under reduced pressure and 3 mL of dry methylene chloride was added to obtain a homogeneous solution.
• a portion of the homogeneous solution was taken and analyzed by 1 H-nuclear magnetic resonance spectroscopy and GPC.
• the uniform solution remaining in the test tube was dried in vacuum to obtain a white powdery substance.
• a portion was taken out and analyzed by 1 H-nuclear magnetic resonance spectroscopy and GPC. After purging the inside of the test tube again with nitrogen, it was similarly heated under vacuum (at 170° C.
• the reactants in the test tube were in a solid state throughout.
• the final product had a weight-average molecular weight of 52,250 and a number-average molecular weight of 25,361, and gave signals in the 1 H-nuclear magnetic resonance spectrum supporting a structure derived from copolymerized polycarbonate.
• Example 5 Weigh 100.9 mg (0.690 mmol) of isosorbide in a heat-resistant glass test tube (15/35 common grind), add a polytetrafluoroethylene stirrer tip, attach a glass three-way cock, and stir the inside of the test tube. Nitrogen was substituted. 2.0 mL of dry acetonitrile under a stream of nitrogen, 783.8 mg (2.16 mmol) of bis(1,1,1,3,3,3-hexafluoroisopropyl) carbonate, 2.6 mg (0.0257 mmol) of triethylamine was added to form a homogeneous solution. The homogeneous solution was stirred with a magnetic stirrer at room temperature for 44 hours.
• the polycarbonate obtained by the production method of the present invention is used for optical members (lenses, optical fibers, films, backlight diffusion plates for LCDs, photoreceptors, etc.), DVD/CD discs, electronic component housings (mobile phones, etc.), and windows for transportation equipment. , transparent roofing materials, windshields, screens, bulletproof windows, tableware, suitcases, helmets, etc.

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